William b



(No Model.)

W. B. TATRO.

FRICTION CLUTCH.

Patented Mar, 2, 1886.

Wm M l as f 9 EBMMW N PEYERS, Pllolo-Lllhognphor. Wlhinglan, D. C.

UNITED STATES PATENT WILLIAM B. TATRO, OF HARTFORD, CONNECTICUT,ASSIGNOR TO THE PIERCE MANUFACTURING COMPANY, OF NEW YORK, N. Y.

FRICTION-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 337,032, dated March 2.1886.

Application filed November 2, 1885. Serial No. 181,554. (No model.)

To all whom it may concern.-

Be it known that I, WILLIAM B. TATRO, of Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Friction-Clutches, of which the following is adescription, reference being had to the accompanying drawings, where-Figure l is a top or plan view of my invention as embodied in a clutchadapted to couple the ends of two pieces of shafting. Fig. 2 isa View inlongitudinal central section of this device on plane denoted by line 00a of Fig. 1. Fig. 31s a plan View ofthe interior of one oftheclutch-body parts, showing an annular clamp and part of the rock-arm,the latter being broken away to show construction. Fig. 4 is a detailview of the device in cross-section on plane denoted by line 3 y of Fig.2.

My invention relates to the class of clutches in which the operativeparts depend for their action upon the frictional grasp of therespective interlocking parts; and it consists in the combination of theclutch-body parts, the expansible annular clamp with inturned arms,between the adjacent faces of which a rockarm is removably supported,and the mechanism by which the rock-arm is operated, and in furtherdetails of the parts and their combination, as more particularlyhereinafter de scribed, and pointed out in the claims.

In the accompanying drawings, the letter a denotes a piece of shafting,and 11 another piece, both being in alignment,with their endsdisconnected,except by means of the frictionclutoh c. This clutch ismade up of the body parts 0 and o The former is secured to one of theshafts, as a, near its end, by means of a key or like device, and Withinthe laterallyopening socket it bears the expansible annular clamp 6.This clamp e fits loosely within the socket d, is divided, as at 6,across its length, and near this division are located the inwardprojecting arms 6', whose adjacent faces taper toward each other as theynear the center. The body part 0 consists of a disklike piece adapted tofit flatly against the open side of body part c, and has a cylindricalhub that extends in both directions from the center of the disk andsubstantially at right angles to it. the end of the shaft a, while theother part, c, fits'upon and is securely fastened to the shaft 1), as bymeans of a key in the ordinary manner of fastening such parts together.The

' this chamber until the end f of the rock-arm is moved toward thecenterof the clutch or shaft. The inward and outward movement of the endf 2 of the rock-arm is effected by means of the sliding collar 9, thatfits upon the outside of the hub c, and is moved by means of an ordinaryshipping device, projecting parts of which fit into an annular groove,9, in the collar. The lower end of the arm f engages in a socket in thiscollar g, so that as the collar is moved toward or from the clutch-bodythe end of the rock-arm will be moved away from or toward the axis ofthe shaft or center of the clutch. Bythe inward radial movement of therock-arm the arms (2 of the clamp are thrust apart, and the outersurface of the clamp,which lies next the wall of the chamber, is forcedagainst that One part, c", of this hub fits upon wall, and by reason ofthe friction between a these surfaces the two parts of the clutch areheld firmly together, and the two pieces of shafting will revolvetogether. The annular clamp is preferably formed of asingle piece ofspring metal, as steel, bent to shape with the arms integral therewith,and a part on each side ofthe opening at e, overhanging the space between the divided ends ofthe clamp, and made so as to allow room for theradial play of the rock-arm, and also to prevent it from coming intocontact with the inner side of the wall forming the periphery ofthe bodypart 0'.

The above-described guard, formed by the substance of the ring lyingbetween the upper or outer side of the arm f z and the clutchbody part,is of material advantage in clutches of this class,ein preventing thearm or lever end from wearing against the inner surface of the rim ofthe clutch-body.

Through the lower end ofthe armf, that is forked,so as to engage the lugon the collar 9, apin is fastened, and this pin passes through a slotinthe lug. as shown in the sectional view in Fig. 2. This particularmeans, however, of connecting the sliding collar with the rock-arm isnot essential, as it is evident that other equally efiicient means maybe used without the exercise of invention.

I claim as rnyinvention-- y 1. In combination, in a friction-clutchyth'ebodypart c. an annular clamp, e, fitted loosely within a socketin thisbody part, and with inwardrprojecting arms with adjacent tapered faces,and a guard overhanging the space be tween the arms, the body part aSupportinga rock-arm with one end between the arms of the clamp, allsubstantially as described.

e fitted loosely within the body part c, and

bearing the inward-projecting arms 0', with adjacent faces tapered, therock-arm f, with the end f located between the arms of the clamp,- andthe armf, engaging the sliding coll-arg, movable on the hub of the bodypart 0", all substantially as described.

WILLIAM B. TATRO. Witnesses: CHAS. L BURDETT,

A. R. WILLIAMS.

